What's this test for?

This test is ideal if you're concerned about your immune system's ability to fight infections or want to monitor your body's natural cancer defense. It measures your Natural Killer (NK) cells, which are specialized immune cells that target and destroy abnormal cells, viruses, and early cancer cells. Many people use this test when they experience frequent infections, are undergoing cancer treatment, or want to assess their immune health.

What happens after I get my results?

You'll receive detailed doctor notes in simple language explaining what your Natural Killer cell levels mean for your immune function and overall health. These notes include personalized recommendations like dietary changes, lifestyle modifications, stress management techniques, or whether you should follow up with an immunologist. You'll also get the standard lab report and can track your immune cell levels over time using our trends feature to see how your interventions are supporting your immune system.

What's included in this test?

This test measures Natural Killer (NK) cells, which are specialized immune cells in your bloodstream. This test measures your Natural Killer (NK) cell count and activity levels, which are crucial indicators of how effectively your immune system can identify and destroy infected or abnormal cells. NK cells are your body's first line of defense against viruses, bacteria, and cancer cells, working around the clock without needing prior exposure to threats. Understanding your NK cell levels helps assess your immune resilience and your body's natural ability to protect against illness and disease.

How should I prepare for this test?

No special preparation is typically required for this test. You can eat and drink normally before your blood draw, and you don't need to fast. However, it's best to schedule your test when you're feeling your baseline normal rather than during an active infection, as acute illness can temporarily affect immune cell counts and may not reflect your typical immune status.

When will I get my results?

Most Natural Killer cell test results are available within 3-5 business days after your blood sample reaches the lab. This test requires specialized flow cytometry analysis to count and evaluate your immune cells, which takes a bit longer than standard blood tests. You'll receive an email notification as soon as your results are ready to view in your secure online account.

Who should consider getting this test?

This test is valuable for people experiencing frequent or prolonged infections, those with a history of cancer or currently in remission, and anyone concerned about their immune system strength. It's also helpful for individuals under chronic stress, those with autoimmune conditions, or people wanting to optimize their immune health through lifestyle changes. Cancer patients and survivors often use this test to monitor their immune recovery and function.

What symptoms indicate I may need this test?

Consider this test if you're experiencing frequent colds or infections that seem to last longer than normal, slow wound healing, or persistent fatigue despite adequate rest. Other signs include recurring viral infections like cold sores or shingles, feeling run-down often, or having concerns about cancer risk due to family history. This test can help determine if your immune system is functioning optimally.

How can I naturally support my immune system and NK cells?

Supporting your Natural Killer cells starts with getting 7-9 hours of quality sleep each night, as sleep deprivation significantly reduces NK cell activity. Regular moderate exercise like brisk walking or cycling boosts NK cell function, while chronic intense exercise can suppress it. Eat a diet rich in colorful fruits and vegetables, mushrooms, garlic, and green tea, and manage stress through meditation or yoga, as chronic stress weakens immune function.

What are Natural Killer cells and why do they matter?

Natural Killer cells are specialized white blood cells that act as your body's security patrol, constantly scanning for and destroying abnormal, infected, or cancerous cells. Unlike other immune cells that need to learn what threats look like, NK cells are born ready to attack, which is why they're called natural killers. They're especially important for fighting viral infections and preventing cancer by eliminating cells before they can multiply and cause disease.

What does low Natural Killer cell activity mean?

Low NK cell activity or count suggests your immune system may not be functioning at its best, which could make you more susceptible to infections and potentially less able to fight abnormal cell growth. This can be caused by chronic stress, poor sleep, nutritional deficiencies, certain medications, or underlying health conditions. Low NK cell function doesn't mean you'll definitely get sick, but it indicates your immune defense could benefit from lifestyle improvements or medical evaluation.

How often should I retest my Natural Killer cells?

If you're actively working to improve your immune function through lifestyle changes, retesting every 3-6 months can help you track progress and see if your interventions are working. For cancer patients or those in remission, your oncologist may recommend more frequent monitoring every 2-3 months. If your initial results are normal and you're feeling healthy, annual testing is typically sufficient for ongoing immune health monitoring.

Getting your blood test with us is easy, private & backed by the power of science.Long story short: In the test options, use the filters or search box to narrow your choices and find the test you want. If you need a hand navigating through options, text our super friendly support team at 754-799-7833, and we'll provide tailored suggestions to help you find the ideal test. Once your order is placed, we’ll create your doctor’s lab order remotely, without any need for you to make a trip to a doctor in person or to talk to the doctor. Expect to receive your doctor’s lab order right in your inbox. It will also be in your patient portal if you need to find it later. We’ll also include instructions regarding fasting and other requirements for your test. Your patient portal will be auto-created hassle-free during checkout. If this is your first time ordering, you'll be prompted to create a password for instant login access to your patient portal. It's a quick way to conveniently access your orders and results whenever you want. When you’re ready, visit one of our 4,000 locations. Just bring your ID – no printing or faxing of your lab order is needed, as your order and details will already be in the lab system. Note that most lab locations don’t accept walk-ins, so it’s best to book an appointment in advance. Don’t worry – we’ll provide detailed instructions along the way. You’ll get your results via email & SMS and dive into understanding your body better. Yup, that easy! If you have any questions, please text us at 754-799-7833 or email support@privatemdlabs.com and we'll gladly help you.

How do I know which test to get?

In the test options, find the test you want. If you’re not sure which test to get, we can lend a hand in finding the right option. Just text or call us at 754-799-7833, email us at support@privatemdlabs.com, and we'll gladly help you. We've got your back and reply quickly.

When will my lab results be available?

Most test results will be available within 1–3 business days. Once they're ready, we'll send an email and text message to let you know. After your blood draw, just hang tight and don't worry – we'll keep you updated and in the loop! If you have any further questions, please text us at 754-799-7833 or email support@privatemdlabs.com, and we'll gladly help you.

Is it possible to make changes to my lab order if I made a mistake with the name, date of birth, or any other details?

Absolutely! We totally understand that errors can happen. No worries, we're here to help you. Just reach out to us via text at 754-799-7833 or shoot us an email at support@privatemdlabs.com. Remember to include your order number and let us know the correct information you’d like to update. Our awesome team will jump right in and make sure everything is sorted out and accurate for you. There are no changes necessary if your address is wrong on the requisition though. We don’t mail anything out. Our lab requires an address to be listed to generate an order.

Do you accept health insurance?

Only HSA & FSA is accepted. Our services are strictly self-pay and cannot be submitted to your health insurance provider except for Health Savings Accounts or Flexible Savings Accounts. This policy applies to all insurance companies, including federal health insurance programs like Medicare. If you have any questions, please text us at 754-799-7833 or email support@privatemdlabs.com.

Can I cancel my order?

Yes. We get it – sometimes your needs change. As long as your samples haven’t been collected yet, we’re happy to help you cancel your order. If you have any further questions, please text us at 754-799-7833 or email support@privatemdlabs.com. You can read more about our cancellation policy here.

How can I find a lab location near me?

During the ordering process, you’ll be able to select a specific lab near you, with no strings attached! You can switch it up later easily and visit any of our authorized locations as long as it’s the same lab company you selected your test for (Quest Diagnostics or Labcorp). Before you proceed with your order, feel free to browse through all our lab locations here. This will give you the peace of mind of knowing that there's a lab nearby your home, office or your favorite gym. If you have any questions, please text us at 754-799-7833 or email support@privatemdlabs.com and we'll gladly help you.

Immune System Test - Natural Killer Cell Check

Getting your blood test with us is easy, private & backed by the power of science.

Long story short:

In the test options, use the filters or search box to narrow your choices and find the test you want.
If you need a hand navigating through options, text our super friendly support team at 754-799-7833, and we'll provide tailored suggestions to help you find the ideal test.
Once your order is placed, we’ll create your doctor’s lab order remotely, without any need for you to make a trip to a doctor in person or to talk to the doctor. Expect to receive your doctor’s lab order right in your inbox. It will also be in your patient portal if you need to find it later. We’ll also include instructions regarding fasting and other requirements for your test. Your patient portal will be auto-created hassle-free during checkout.
If this is your first time ordering, you'll be prompted to create a password for instant login access to your patient portal. It's a quick way to conveniently access your orders and results whenever you want.
When you’re ready, visit one of our 4,000 locations. Just bring your ID – no printing or faxing of your lab order is needed, as your order and details will already be in the lab system.
Note that most lab locations don’t accept walk-ins, so it’s best to book an appointment in advance. Don’t worry – we’ll provide detailed instructions along the way.
You’ll get your results via email & SMS and dive into understanding your body better. Yup, that easy!

754-799-7833

[email protected]

Blood Test for Immune System and Cancer Defense

Natural Killer Cells

90 day happiness guarantee

Prescription & fees included

Easy to understand results

Fast & convenient

90 day happiness guarantee

Prescription & fees included

Easy to understand results

Fast & convenient

What's this test for?

How should I prepare for this test?

What's included in this test?

Here’s why 1,000,000+ customers chose us for affordable hassle-free private blood testing.

Blood Test for Immune System and Cancer Defense

90 day happiness guarantee

Prescription & fees included

Easy to understand results

Fast & convenient

1,000,000+ blood tests later, here's what our customers say